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   <div id="projectname">Reranker Framework (ReFr)
   
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   <div id="projectbrief">Reranking framework for structure prediction and discriminative language modeling</div>
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<div class="title">interpreter.C</div>  </div>
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<a href="interpreter_8_c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright 2012, Google Inc.</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">//</span>
<a name="l00004"></a>00004 <span class="comment">// Redistribution and use in source and binary forms, with or without</span>
<a name="l00005"></a>00005 <span class="comment">// modification, are permitted provided that the following conditions are</span>
<a name="l00006"></a>00006 <span class="comment">// met:</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">//   * Redistributions of source code must retain the above copyright</span>
<a name="l00009"></a>00009 <span class="comment">//     notice, this list of conditions and the following disclaimer.</span>
<a name="l00010"></a>00010 <span class="comment">//   * Redistributions in binary form must reproduce the above</span>
<a name="l00011"></a>00011 <span class="comment">//     copyright notice, this list of conditions and the following disclaimer</span>
<a name="l00012"></a>00012 <span class="comment">//     in the documentation and/or other materials provided with the</span>
<a name="l00013"></a>00013 <span class="comment">//     distribution.</span>
<a name="l00014"></a>00014 <span class="comment">//   * Neither the name of Google Inc. nor the names of its</span>
<a name="l00015"></a>00015 <span class="comment">//     contributors may be used to endorse or promote products derived from</span>
<a name="l00016"></a>00016 <span class="comment">//     this software without specific prior written permission.</span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00018"></a>00018 <span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00019"></a>00019 <span class="comment">// &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00020"></a>00020 <span class="comment">// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00021"></a>00021 <span class="comment">// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00022"></a>00022 <span class="comment">// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00023"></a>00023 <span class="comment">// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00024"></a>00024 <span class="comment">// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<a name="l00025"></a>00025 <span class="comment">// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<a name="l00026"></a>00026 <span class="comment">// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00027"></a>00027 <span class="comment">// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00028"></a>00028 <span class="comment">// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00029"></a>00029 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00030"></a>00030 <span class="comment">//</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00035"></a>00035 <span class="comment"></span>
<a name="l00036"></a>00036 <span class="preprocessor">#include &lt;sstream&gt;</span>
<a name="l00037"></a>00037 
<a name="l00038"></a>00038 <span class="preprocessor">#include &quot;<a class="code" href="interpreter_8_h.html" title="Provides an interpreter for assigning primitives and Factory-constructible objects to named variables...">interpreter.H</a>&quot;</span>
<a name="l00039"></a>00039 
<a name="l00040"></a>00040 <span class="keyword">using namespace </span>std;
<a name="l00041"></a>00041 
<a name="l00042"></a>00042 <span class="keyword">namespace </span>reranker {
<a name="l00043"></a>00043 
<a name="l00044"></a>00044 <span class="keyword">using</span> std::ostringstream;
<a name="l00045"></a>00045 
<a name="l00046"></a>00046 <span class="keywordtype">void</span>
<a name="l00047"></a>00047 Interpreter::Eval(StreamTokenizer &amp;st) {
<a name="l00048"></a>00048   <span class="comment">// Keeps reading assignment statements until there are no more tokens.</span>
<a name="l00049"></a>00049   <span class="keywordflow">while</span> (st.PeekTokenType() != StreamTokenizer::EOF_TYPE) {
<a name="l00050"></a>00050     <span class="comment">// Read variable name.</span>
<a name="l00051"></a>00051     StreamTokenizer::TokenType token_type = st.PeekTokenType();
<a name="l00052"></a>00052     <span class="keywordflow">if</span> (token_type != StreamTokenizer::IDENTIFIER) {
<a name="l00053"></a>00053       WrongTokenTypeError(st.PeekTokenStart(), StreamTokenizer::IDENTIFIER,
<a name="l00054"></a>00054                           token_type, st.Peek());
<a name="l00055"></a>00055     }
<a name="l00056"></a>00056     <span class="keywordtype">string</span> varname = st.Next();
<a name="l00057"></a>00057 
<a name="l00058"></a>00058     <span class="comment">// Next, read equals sign.</span>
<a name="l00059"></a>00059     token_type = st.PeekTokenType();
<a name="l00060"></a>00060     <span class="keywordflow">if</span> (st.Peek() != <span class="stringliteral">&quot;=&quot;</span>) {
<a name="l00061"></a>00061       WrongTokenError(st.PeekTokenStart(), <span class="stringliteral">&quot;=&quot;</span>, st.Peek(), st.PeekTokenType());
<a name="l00062"></a>00062     }
<a name="l00063"></a>00063     <span class="comment">/*</span>
<a name="l00064"></a>00064 <span class="comment">    if (token_type != StreamTokenizer::RESERVED_CHAR) {</span>
<a name="l00065"></a>00065 <span class="comment">      WrongTokenTypeError(st.PeekTokenStart(), StreamTokenizer::RESERVED_CHAR,</span>
<a name="l00066"></a>00066 <span class="comment">                          token_type, st.Peek());</span>
<a name="l00067"></a>00067 <span class="comment">    }</span>
<a name="l00068"></a>00068 <span class="comment">    */</span>
<a name="l00069"></a>00069 
<a name="l00070"></a>00070     <span class="comment">// Consume equals sign.</span>
<a name="l00071"></a>00071     st.Next();
<a name="l00072"></a>00072 
<a name="l00073"></a>00073     <span class="keywordflow">if</span> (st.PeekTokenType() == StreamTokenizer::EOF_TYPE) {
<a name="l00074"></a>00074       ostringstream err_ss;
<a name="l00075"></a>00075       err_ss &lt;&lt; <span class="stringliteral">&quot;Interpreter:&quot;</span> &lt;&lt; filename_
<a name="l00076"></a>00076              &lt;&lt; <span class="stringliteral">&quot;: error: unexpected EOF at stream position &quot;</span>
<a name="l00077"></a>00077              &lt;&lt; st.tellg();
<a name="l00078"></a>00078       <span class="keywordflow">throw</span> std::runtime_error(err_ss.str());
<a name="l00079"></a>00079     }
<a name="l00080"></a>00080 
<a name="l00081"></a>00081     <span class="comment">// Consume and set the value for this variable in the environment.</span>
<a name="l00082"></a>00082     env_-&gt;ReadAndSet(varname, st);
<a name="l00083"></a>00083 
<a name="l00084"></a>00084     token_type = st.PeekTokenType();
<a name="l00085"></a>00085     <span class="keywordflow">if</span> (st.Peek() != <span class="stringliteral">&quot;;&quot;</span>) {
<a name="l00086"></a>00086       WrongTokenError(st.PeekTokenStart(), <span class="stringliteral">&quot;;&quot;</span>, st.Peek(), st.PeekTokenType());
<a name="l00087"></a>00087     }
<a name="l00088"></a>00088     <span class="comment">// Consume semicolon.</span>
<a name="l00089"></a>00089     st.Next();
<a name="l00090"></a>00090   }
<a name="l00091"></a>00091 }
<a name="l00092"></a>00092 
<a name="l00093"></a>00093 <span class="keywordtype">void</span>
<a name="l00094"></a>00094 Interpreter::WrongTokenError(<span class="keywordtype">size_t</span> pos,
<a name="l00095"></a>00095                              <span class="keyword">const</span> <span class="keywordtype">string</span> &amp;expected,
<a name="l00096"></a>00096                              <span class="keyword">const</span> <span class="keywordtype">string</span> &amp;found,
<a name="l00097"></a>00097                              StreamTokenizer::TokenType found_type)<span class="keyword"> const </span>{
<a name="l00098"></a>00098   ostringstream err_ss;
<a name="l00099"></a>00099   err_ss &lt;&lt; <span class="stringliteral">&quot;Interpreter:&quot;</span> &lt;&lt; filename_ &lt;&lt; <span class="stringliteral">&quot;: at stream pos &quot;</span> &lt;&lt; pos
<a name="l00100"></a>00100          &lt;&lt; <span class="stringliteral">&quot; expected token \&quot;&quot;</span> &lt;&lt; expected &lt;&lt; <span class="stringliteral">&quot;\&quot; but found \&quot;&quot;</span> &lt;&lt; found
<a name="l00101"></a>00101          &lt;&lt; <span class="stringliteral">&quot;\&quot; (token type: &quot;</span> &lt;&lt; StreamTokenizer::TypeName(found_type)
<a name="l00102"></a>00102          &lt;&lt; <span class="stringliteral">&quot;)&quot;</span>;
<a name="l00103"></a>00103   <span class="keywordflow">throw</span> std::runtime_error(err_ss.str());
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105 
<a name="l00106"></a>00106 <span class="keywordtype">void</span>
<a name="l00107"></a>00107 Interpreter::WrongTokenTypeError(<span class="keywordtype">size_t</span> pos,
<a name="l00108"></a>00108                                  StreamTokenizer::TokenType expected,
<a name="l00109"></a>00109                                  StreamTokenizer::TokenType found,
<a name="l00110"></a>00110                                  <span class="keyword">const</span> <span class="keywordtype">string</span> &amp;token)<span class="keyword"> const </span>{
<a name="l00111"></a>00111   ostringstream err_ss;
<a name="l00112"></a>00112   err_ss &lt;&lt; <span class="stringliteral">&quot;Interpreter:&quot;</span> &lt;&lt; filename_ &lt;&lt; <span class="stringliteral">&quot;: at stream pos &quot;</span> &lt;&lt; pos
<a name="l00113"></a>00113          &lt;&lt; <span class="stringliteral">&quot; expected token type &quot;</span> &lt;&lt; StreamTokenizer::TypeName(expected)
<a name="l00114"></a>00114          &lt;&lt; <span class="stringliteral">&quot; but found &quot;</span> &lt;&lt; StreamTokenizer::TypeName(found)
<a name="l00115"></a>00115          &lt;&lt; <span class="stringliteral">&quot;; token=\&quot;&quot;</span> &lt;&lt; token &lt;&lt; <span class="stringliteral">&quot;\&quot;&quot;</span>;
<a name="l00116"></a>00116   <span class="keywordflow">throw</span> std::runtime_error(err_ss.str());
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118 
<a name="l00119"></a>00119 }  <span class="comment">// namespace reranker</span>
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